PIAS
| Acronym | Definition |
|---|---|
| PIAS | Play It Again Sam (record label) |
| PIAS | Play It Again Sports (chain of used sports equipment stores) |
| PIAS | Protein Inhibitor of Activated Signal (protein) |
| PIAS | Professional Investment Advisory Services (financial services; Singapore) |
| PIAS | Program for the Integral Approach of Ship Design (naval software; Netherlands) |
| PIAS | Presque Isle Audubon Society (Pennsylvania) |
| PIAS | Photon-counting Image Acquisition System |
| PIAS | PLRS Intelligence Augmentation System |